Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1991-05-07
1993-04-27
Dees, Jose G.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528315, 528320, 549214, 556425, C08G 6908, C07D32304, C07F 704, C07F 708
Patent
active
052063372
ABSTRACT:
The present invention provides an oligomer having an inherent viscosity .eta. of 0.001-0.5 dl/g as measured at a concentration of 0.5 g/dl in N-methyl-2-pyrrolidone at 30.degree. C., which has been obtained by subjecting to polymerization and imidization (a) an acid component consisting of an aromatic tetracarboxylic acid dianhydride and/or a derivative thereof and (b) a diamine component consisting of 5-100 mole % of a diaminosiloxane represented by the undermentioned formula (I) and 95-0 mole % of an organic diamine other than the formula (I): ##STR1## wherein R.sub.1 is a divalent aliphatic group of 1-5 carbon atoms or a divalent aromatic group of 6 or more carbon atoms; R.sub.2 and R.sub.3 are each a monovalent aliphatic or aromatic group and may be the same or different; and m is an integer of 1-100, as well as an oligomer solution obtained by dissolving the above oligomer in an organic solvent.
REFERENCES:
patent: 3553282 (1971-01-01), Holub et al.
patent: 4520075 (1985-05-01), Igarashi et al.
patent: 4535099 (1985-08-01), Raymond et al.
patent: 4586997 (1986-05-01), Chung et al.
patent: 4670497 (1987-06-01), Yutaka et al.
Takeda Naoshige
Takeda Toshiro
Tokoh Akira
Conrad Joseph M.
Dees Jos,e G.
Sumitomo Bakelite Company Limited
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